A derivative of filth. Meaning lower than specks of dust on your shoes.
Man, that is pure firth!
door Crismon 16 juni 2003
The process of being penetrated in the booty hole while giving birth.
Christopher is a firth baby.
door CupDude 17 februari 2009
Puss-filled bubble, usually located around the anus.
"Yo, is that Firth in that Chevy?"
door Dr. Curtis 6 december 2003